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-rw-r--r--fs/nfs/idmap.c2
-rw-r--r--include/linux/key.h1
-rw-r--r--net/dns_resolver/dns_query.c1
-rw-r--r--security/keys/keyctl.c15
4 files changed, 18 insertions, 1 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 567983d2c0eb..b7458d77f511 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -282,6 +282,8 @@ static struct key *nfs_idmap_request_key(const char *name, size_t namelen,
desc, "", 0, idmap);
mutex_unlock(&idmap->idmap_mutex);
}
+ if (!IS_ERR(rkey))
+ set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
kfree(desc);
return rkey;
diff --git a/include/linux/key.h b/include/linux/key.h
index 017b0826642f..e37a4d807185 100644
--- a/include/linux/key.h
+++ b/include/linux/key.h
@@ -170,6 +170,7 @@ struct key {
#define KEY_FLAG_INVALIDATED 7 /* set if key has been invalidated */
#define KEY_FLAG_TRUSTED 8 /* set if key is trusted */
#define KEY_FLAG_TRUSTED_ONLY 9 /* set if keyring only accepts links to trusted keys */
+#define KEY_FLAG_ROOT_CAN_INVAL 11 /* set if key can be invalidated by root without permission */
/* the key type and key description string
* - the desc is used to match a key against search criteria
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index 9acec61f5433..9a32f55cf9b9 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -129,6 +129,7 @@ int dns_query(const char *type, const char *name, size_t namelen,
}
down_read(&rkey->sem);
+ set_bit(KEY_FLAG_ROOT_CAN_INVAL, &rkey->flags);
rkey->perm |= KEY_USR_VIEW;
ret = key_validate(rkey);
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index cd5bd0cef25d..609f8d326ddc 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -404,12 +404,25 @@ long keyctl_invalidate_key(key_serial_t id)
key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH);
if (IS_ERR(key_ref)) {
ret = PTR_ERR(key_ref);
+
+ /* Root is permitted to invalidate certain special keys */
+ if (capable(CAP_SYS_ADMIN)) {
+ key_ref = lookup_user_key(id, 0, 0);
+ if (IS_ERR(key_ref))
+ goto error;
+ if (test_bit(KEY_FLAG_ROOT_CAN_INVAL,
+ &key_ref_to_ptr(key_ref)->flags))
+ goto invalidate;
+ goto error_put;
+ }
+
goto error;
}
+invalidate:
key_invalidate(key_ref_to_ptr(key_ref));
ret = 0;
-
+error_put:
key_ref_put(key_ref);
error:
kleave(" = %ld", ret);